It's a cool project, but I wouldn't necessarily call it a start-up. How will you monetize while depending on FB? Is this currently a pain-point for people, to the point that they would pay money for it?
Its a pain point for some, since I see lots of people scrolling through their news feed to find a video they watched before or just to kill time.
When are you planning to have a business model then? It appears the users are* the product again, as usual.
It looks nice though.
*) or will be.